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Chapter 3
CPU Function
Preliminary User’s Manual U15839EE1V0UM00
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Internal peripheral I/O area
4 KB of memory, addresses 3FFF000H to 3FFFFFFH, is provided as an internal peripheral I/O
area.
Figure 3-13:
Internal Peripheral I/O Area
Peripheral I/O registers associated with the operation mode specification and the state monitoring
for the internal peripherals I/O are all memory-mapped to the internal peripheral I/O area. Program
fetches cannot be executed from this area.
Cautions: 1. In the V850E/CA2, no registers exist which are capable of word access. But if a
register is word accessed, half word access is performed twice in the order of
lower address, then higher address of the word area, ignoring the lower 2 bits of
the address.
2. For registers in which byte access is possible, if half word access is executed,
the higher 8 bits become undefined during the read operation, and the lower 8
bits of data are written to the register during the write operation.
3. Addresses that are not defined as registers are reserved for future expansion. If
these addresses are accessed, the operation is undefined and not guaranteed.
4. Addresses 3FF F000H to 3FF FFFFH cannot be specified as the source/destina-
tion address of DMA transfer. Be sure to use addresses FFF F000H to FFF FFFFH
for source/destination address of DMA transfer.
Additionally to the peripheral I/O area, a 16 KB area is provided as a programmable peripheral I/O
area (refer to 3.5.4 “Programmable peripheral I/O registers” on page 83).
Internal Peripheral I/O area
(4 Kbytes)
3FF FFFFH
3FF 0000H
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